Adjustable cam mechanism



Oct. 31, 1950 w. L. DAVIS ADJUSTABLE CAM MECHANISM Filed July 17, 1948 Patented Oct. 31, 1950 ADJUSTABLE oAM MECHANISM Williams L. Davis, Savannah, Ga., assignor to Union Bag 85 Paper Corporation, New York, N. Y., a corporation of New Jersey I A Application July 17, 1948, Serial No. 39,212

The present invention relates to improvements in adjustable cam mechanism. lvfore particularly' it pertains to a cam mechanism by which varying axial and radial movements may be obtained in a machine, and the invention is particularly applicable to the opening cylinder assembly on paperbag making machines.

In paper bag makin machines it is necessary in the opening cylinder .assembly to vary the axial and radial movements for different size bags. Such movements are obtained by means of similar cams on each side of the machine. To make adjustments in these cams it is common practice either to change the cam itself or to make a complicated adjustment of the cam position, with the result that there is a long shutdown time required during the change-over from one bag size to another. 7

The present invention provides an adjustable cam mechanism which simplifies the adjustment of the cams, provides a more accurate means of setting the rightand left-hand cams in the same relative position, and gives far less trouble than the present cam adjustments. Furthermore it is possible with the present invention to adjust the rightand left-hand cams either, separately or together while the bag machine is running, thereby insuring the proper setting of the cams under operating conditions and overcoming the necessity of constantly stopping and starting the machine until the proper setting has been achieved.

A general object of the present invention is to provide a cam mechanism which is not only simple to adjust but is also easy to install on a machine, such mechanism being economic of manufacture and well suited to the purposes for which it is intended.

More specifically, it is an object of the present invention to provide a cam mechanism having a.

stationary cam mount on which are mounted the fixed portion of an axial cam and the fixed portion of a radial cam, an adjustable axial cam mount on which is mounted the adjustable portion of the axial cam, an adjustable radial cam mount on which is mounted the adjustable portion of the radial cam, and means for rotating the adjustable cam mounts and the portions of the cams mounted thereon. I

Other objects of the invention'will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the fea tures of construction, combination of elements and arrangement of parts which will be exempli- '7 Claims. (Cl. 74568) engage a gear 2|.

fied in the construction hereinafter set forth and ti the scope of the invention will be indicated in the claims.

For a fullerunderstanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure 1' is a perspective view showing the component parts which make up the cam of the present invention;

Figure 2 is a perspective view showing rightand left-hand cam mechanisms embodying the present invention as the same would be used in conjunction with a paper bag making machine.

In the following description my invention is particularly described in connection with the rightand left-hand cam mechanisms which would be used in connection with a paper bag making machine, but it will be understood that this is merely for the purpose of illustration and that the invention is applicable to'various machines and that the cam mechanism andthe adjustment therefore may also be used singly.

Referring more particularly to the drawing, there is shown in Figure 1 a stationary cam mount l0 having a plate portion H, a raised plate. portion l2 and a cylinder portion l 3. The fixed portion M of an axial cam is mounted on the raised plate portion [2 by means of screws l5. Mounted on the cylinder portion [3 by means of screws i6 is the fixed portion [1 of a radial cam.

Further referring to Figure 1 there is also shown an adjustable axial cam mount l8 on which is mounted the adjustable portion 19 of the axial cam. This adjustable cam mount i8 is provided with a toothed section 2!] which is adapted to This gear is provided with a key 22 for keying the gear to a shaft and pins 23 for fastenin together the gears which engage the adjustable cam mounts.

In Figure 1 there is further shown an adjustable radial cam mount 2:; consisting of a plate 25 and a sectioned cylinder 26. Mounted on this sectioned cylinder by means of screws 21 is the adjustable portion 28 of the radial cam. This cam mount 24 is provided with a toothed section 29 adapted to engage a gear 30 which gear is provided with a slot 3| to receive the key 22 and holes 32 to receive the pins 23.

In Figure 2 the cam mechanisms of the present invention are shown as they would be mounted on the rightand left-hand sides of a paper bag making machine, so that the same axial and radial movements can be obtained simultaneously in the opening cylinder assembly of the machine.

The left-hand cam mechanism shows the component parts of Figure 1 assembled in operating condition. The adjustable axial cam mount l8 slidably fits over and around the raised plate por-- tion E2 of the stationary card mount it and the adjustable portion [9 of the axial cam mounted on the cam mount i8 engages the fixed portion of the axial cam i l mounted on the cam mount it. By rotatin the adjustable cam mount and the portion mounted. thereon with respect to the fixed portion of the axial cam it is possible to obtain varied axial movements by means. of the axial cam. Likewise, the adjustable radial cam mount 24 is fitted against the stationary cam mount it and the adjustable axial cam mount l8. Before this radial cam mount 2% can be slid into position, screws 55 and the fixed portion of the radial cam ll must be removed from the cylinder portion 13, after which the sectioned cylinder 26 of the radial cam mount 24 can be slid into position over the cylinder portion 53, and the fixed portion ll of the radial cam mount and screws it can be replaced. The three cam mounts are thus held in position. With the radial cam mount 2 3 in position the adjustable portion 28 of the radial cam engages the fixed portion of the radial cam so that a rotation of this radial cam mountand the cam portion mounted thereon will give varied radial movements by means of the radial cam.

The gears 2i and 3% which engage the two toothed sections of the adjustable cam mounts are pinned together and keyed to a shaft 33. This shaft is carried through a tube 34 and on the end of the shaft andkeyed thereto is ,a hand wheel 3-5 so that it is possible to rotate the hand wheel and simultaneously vary the axial and radial cams. Since the cam mechanism illustrated by the drawings is shown as it would be used in connection with the opening cylinder assembly of a paper bag machine, the gears 2! and 3tareof-different diameter and vary as to the number of teeth. This permits the axial cam and the'radial cam to be varied with respect to each other in apredetermined ratio merely by turning the hand wheel 35. It will be understood that the gears ma be of the same diameter, have the same number of teeth, or may be varied in both respects without changing the principle of operation or" the present invention.

The right-hand cam mechanism illustrated in Figure 2 is the same in all respects as the left-hand cam mechanism above described. Viewin the right-hand mechanism the stationary cam mount 36, corresponding to the stationary cam mount l0, shows tapped holes 3'! which are provided in both stationary cam mounts for affixing them to a frame or other support. To rotate the adjustable cam mounts for the right-hand mechanism there is a gear 38 corresponding to the gear 2! and a gear (not shown) corresponding to the gear 30. These gears are likewise pinned together as above described and are keyed to the tube There is securely ainxed to the tube 34 a hand wheel 39 so that the axial-and radial cams of the right-hand mechanism can be adjusted by rotating the hand wheel 39.

The end of the shaft 33, to which is keyed the hand wheel 35, is threaded and bears a nut iii]. The hub of the hand wheel 35 butts against the tube 34. Since the hand wheel 35 is slidably keyed to the shaft it is possible by means of the nut Gil to tighten the wheel 35 against the tube 34 so that both wheels are locked together and the cams on both the right and left can thereby be adjusted simultaneously by the rotation of the outer hand wheel 35. If the nut 40 i loosened and the hand wheels are not locked together in position it is possible to adjust each mechanism independently of the other.

While I have illustrated one particular embodiment of my invention and one particular application thereof, it will be understood that various changes and modifications may be made therein and the invention maybe used in connection with various types of machines where variations in the axial and radial movements are required.

It will thus be seen that the objects herein set forth may readily and efficiently be attained and since certain changes may be made in the above construction and diirerent embodiments of the invention could be made without departing from the scope thereof it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to'cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A cam mechanism comprising an axial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, a-cazn mount supporting the fixed-portions of the axial and radial cams, rotatable cam mounts supporting the adjustable portions of the axial and radial cams and means fcrmoving the rotatable cam mounts and the portions-of the cams-mounted thereon.

2. A cam mechanism comprising a cam mount on which is mounted a portion of an axial cam and a portion of a radial cam, an adjustable axial cam mount on which-is mounted another portion of the axial cam, an adjustable radial cam mount on which is mounted another portion ofthe radial cam, and means for rotating the adjustable cam mounts and the portions of the cams mounted thereon.

3. A cam mechanism comprising an axial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, said cams being in juxtaposition and havin the same axis, cam mounts supporting the adjustable portions of the axial and radial cams, and means for rotating the said cam mounts and the portions of the cams mounted thereon.

4. A cam mechanism comprising an axial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, a cam mount supporting the fixed portions of the axial and radial cams, rotatable cam'mo-unts supporting the adjustable portions of the axial and radia" cams and provided with toothed sections, gears engaging the toothed sections of the rotatable cam mounts, and a shaft affixed to said gears, whereby the axial and radial cams may be varied byrotating the shaft.

5. A cam mechanism comprising anaxial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, said cams being in juxtaposition and having thesame axis, cam mounts supporting the adjustable portions of the axial and radial cams and provided with toothed sections, coacting gears engaging the toothed sections, so constructed that the cam mounts and portions of the cams mounted thereon may be rotated in a predetermined ratio.

6. A cam mechanism comprising an axial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, said cams being in juxtaposition and havin the same axis, cam mounts supporting the adjustable 15o tions of the axial and radial cams and pro d with means for rotating the cam mounts and "e portions of the cams mounted thereon, said tatlng means being interconnected and havin a predetermined ratio, whereby the axial and radial cams may be varied simultaneously in a predetermined ratio.

7. A cam mechanism comprising an axial cam having fixed and adjustable portions, a radial cam having fixed and adjustable portions, s'ajid cams being in juxtaposition and having the same axis, cam mounts supporting the adjustable por tions of the axial and radial cams and provided with toothed sections, gears engaging the toothed sections, said gears being interconnected and having a predetermined ratio, means for rotating said gears, whereby the axial and: radial cams may be varied simultaneously in a predetermined ratio.

WILLIAM L. DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

